1. Institute for Immunology and Transfusion Medicine, Ernst Moritz Arndt University, Greifswald, Germany;
2. Institute for Clinical Immunology and Transfusion Medicine, Justus Liebig University, Giessen, Germany;
3. Institute for Laboratory Medicine and Pathobiochemistry, Molecular Diagnostics, Philipps Marburg University, Germany; and
4. Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI